Mybatis批量插入数据返回主键的实现

响应效果（id为主键）：

{
  "data": [
    {"studentName": "张三","classNo": "一班","id": 111},
    {"studentName": "李四","classNo": "二班","id": 112},
    {"studentName": "王五","classNo": "一班","id": 113}
  ]
}

控制层：

    @PostMapping("/test")
 @ResponseBody
 public Map<String, Object> test(@RequestBody String data) {
 Map<String, Object> resultMap = new HashMap<String, Object>();
        //非空校验
 if (!checkParams.checkString(data)) {
  resultMap.put("code", "1");
  resultMap.put("msg", "参数为空。");
  return resultMap;
 }
        //json转List<Map<String, Object>>
 JSONObject json= new JSONObject(data);
 String dataString = json.get("data").toString();
 com.google.gson.Gson gson = new Gson();
  List<Map<String, Object>> list = gson.fromJson(dataString, new   com.google.common.reflect.TypeToken<List<Map<String, Object>>>() {
  }.getType());
        //请求接口
 resultMap=registerService.test(list);
 return resultMap;
 }

接口：

public Map<String, Object> test(List<Map<String,Object>> data);

实现类：

    @Override
 public Map<String, Object> test(List<Map<String,Object>> data) {
 Map<String, Object> resultMap = new HashMap<String, Object>();
 registerMapper.test( data);
 resultMap.put("data",data);
 return resultMap;
 }

持久层：

    public void test(List<Map<String,Object>> list);

statement：

    <!-- =========================批量插入返回主键示例======================== -->
 <insert id="test" parameterType="list" useGeneratedKeys="true" keyProperty="id" >
 INSERT INTO student_info(student_name,class_no)VALUES
 <foreach collection="list" item="item" separator=",">
  (
  #{item.studentName},
  #{item.classNo}
  )
 </foreach>
 </insert>

请求方式：

http://localhost/xxx/test

请求参数：

{
  "data": [
    {"studentName": "张三","classNo": "一班"},
    {"studentName": "李四","classNo": "二班"},
    {"studentName": "王五","classNo": "一班"}
  ]
}

注意事项：

statement中keyProperty的赋值是可以自定义的，如果将keyProperty的值改为key，即改成如下：

    <!-- =========================批量插入返回主键示例======================== -->
 <insert id="test" parameterType="list" useGeneratedKeys="true" keyProperty="key" >
 INSERT INTO student_info(student_name,class_no)VALUES
 <foreach collection="list" item="item" separator=",">
  (
  #{item.studentName},
  #{item.classNo}
  )
 </foreach>
 </insert>

则响应效果（key为主键）如下：

{
  "data": [
    {"studentName": "张三","classNo": "一班","key": 111},
    {"studentName": "李四","classNo": "二班","key": 112},
    {"studentName": "王五","classNo": "一班","key": 113}
  ]
}

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